JP6977586B2 - Hot water supply piping device and hot water storage type water heater - Google Patents

Description

The present invention relates to a hot water supply piping device and a hot water storage type water heater.

Patent Document 1 discloses a hot water storage type water heater. In a hot water storage type water heater, when the pressure on the primary side of the bath pilot solenoid valve is atmospheric pressure, the atmospheric release valve opens. When the pressure on the primary side of the pilot solenoid valve for the bath is applied, the atmospheric release valve gradually closes. Therefore, the hot water storage type water heater can prevent the bathtub water from flowing back into the hot water storage tank.

Japanese Unexamined Patent Publication No. 2015-2109019

However, in the hot water storage type water heater described in Patent Document 1, when the pressure applied to the hot water storage tank side of the solenoid valve is low, such as when water is supplied to the hot water storage tank at the time of construction, the bath pilot type solenoid valve 1 On the next side, the check valve opens. At this time, the atmosphere release valve may not close. In this case, a water leak occurs in the air release valve.

The present invention has been made to solve the above-mentioned problems. An object of the present invention is to prevent water leakage from an air release valve. It is to provide a hot water supply piping device and a hot water storage type water heater.

The hot water supply piping device according to the present invention is provided in the bath hot water supply pipe that supplies hot water to the bathtub, and opens the bath hot water supply pipe to the atmosphere when the internal water pressure on the upstream side of the bath hot water supply pipe is less than the first pressure. An air release valve that closes the bath hot water supply pipe to the atmosphere when the internal water pressure on the upstream side of the bath hot water supply pipe is equal to or higher than the first pressure, and a hot water supply pipe that is installed on the upstream side of the air open valve to close the bath hot water supply pipe. When the internal water pressure on the upstream side is greater than the first pressure and less than the operating pressure, the flow path of the bath hot water supply pipe is closed, and when the internal water pressure on the upstream side of the bath hot water supply pipe is higher than the operating pressure, the flow of the bath hot water supply pipe The check valve is provided with a check valve that opens a path, and the maximum head pressure generated by the mass of water inside the check valve on the upstream side of the bath hot water supply pipe is set as the operating pressure .

The hot water storage type water heater according to the present invention includes a hot water supply piping device, a hot water storage tank provided on the upstream side of the hot water supply piping device, and a control unit that controls to supply hot water stored in the hot water storage tank to the hot water supply piping device. Equipped with.

According to these inventions, water leakage from the air release valve can be prevented.

It is a block diagram of the hot water supply system to which the hot water storage type water heater provided with the hot water supply piping device in Embodiment 1 is applied. FIG. 3 is a schematic front view of a pilot solenoid valve for a bath of a hot water storage type water heater provided with a hot water supply piping device according to the first embodiment. FIG. 5 is a schematic side view of a pilot solenoid valve for a bath of a hot water storage type water heater provided with a hot water supply piping device according to the first embodiment. It is a side sectional view of the pilot solenoid valve for the bath of the hot water storage type water heater provided with the hot water supply piping device in Embodiment 1. FIG. It is a side sectional view of the pilot solenoid valve for the bath of the hot water storage type water heater provided with the hot water supply piping device in Embodiment 1. FIG.

A mode for carrying out the present invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are designated by the same reference numerals. The duplicate description of the relevant part will be simplified or omitted as appropriate.

Embodiment 1.
FIG. 1 is a configuration diagram of a hot water supply system to which a hot water storage type water heater provided with a hot water supply piping device according to the first embodiment is applied.

In FIG. 1, the bathtub 1 is provided in a bathroom or the like at home. The bathtub adapter 2 is provided on the inner surface of the bathtub 1.

The hot water storage type water heater 3 includes an HP unit 4, a tank unit 5, and a remote controller 6.

The HP unit 4 includes an air heat exchanger 7, a compressor 8, a water refrigerant heat exchanger 9, an expansion valve 10, and a refrigerant pipe 11.

The HP unit 4 utilizes a heat pump cycle. Specifically, in the HP unit 4, the air heat exchanger 7, the compressor 8, the primary side of the water refrigerant heat exchanger 9, and the expansion valve 10 are connected in an annular shape via the refrigerant pipe 11. The inlet side of the secondary side of the water-refrigerant heat exchanger 9 is connected to the outlet side of the HP going pipe 12. The exit side of the secondary side of the water-refrigerant heat exchanger 9 is connected to the entry side of the HP return pipe 13.

The air heat exchanger 7 is provided so that heat can be exchanged between the refrigerant in the refrigerant pipe 11 and the atmosphere. The compressor 8 is provided so that the temperature of the refrigerant can be raised by compressing the refrigerant. The water-refrigerant heat exchanger 9 is provided so that heat can be exchanged between the refrigerant flowing on the primary side and the low-temperature water flowing on the secondary side. The expansion valve 10 is provided so that the temperature of the refrigerant can be lowered by expanding the refrigerant.

The tank unit 5 includes a hot water storage tank 14, a water inlet 15, a water outlet 16, a hot water inlet 17, a hot water inlet 18, a plurality of hot water storage temperature sensors 19, and a full water sensor 20.

The lower part of the hot water storage tank 14 is provided so that low temperature water can flow in. The upper part of the hot water storage tank 14 is provided so that hot water can flow in. The upper part and the lower part of the hot water storage tank 14 are provided so as to be able to store hot water having a temperature difference. The water introduction port 15 is provided at the lower part of the hot water storage tank 14. The water outlet 16 is provided at the lower part of the hot water storage tank 14. The hot water introduction port 17 is provided between the central portion and the lower portion of the hot water storage tank 14. The hot water introduction outlet 18 is provided in the upper part of the hot water storage tank 14. The plurality of hot water storage temperature sensors 19 are attached to the surface of the hot water storage tank 14 at different heights. The full water sensor 20 is provided on the upper part of the hot water storage tank 14.

The tank unit 5 includes a first water supply pipe 21, a second water supply pipe 22, a third water supply pipe 23, a hot water supply pipe 24, a water outlet pipe 25, and a hot water supply pipe 26.

The entrance side of the first water supply pipe 21 is connected to a water source such as water supply. The first water supply pipe 21 is provided so as to be able to receive water supply from a water source such as water supply. The outlet side of the second water supply pipe 22 branches from the middle. The outlet side of the third water supply pipe 23 is connected to the water introduction port 15. The inlet side of the hot water supply pipe 24 is connected to the hot water introduction outlet 18. The outlet side of the hot water supply pipe 24 branches from the middle. The hot water supply pipe 24 is provided so that the hot water stored inside the hot water storage tank 14 can be supplied to the outside of the hot water storage type water heater 3. The entrance side of the water outlet pipe 25 is connected to the water outlet 16. The outlet side of the hot water supply pipe 26 is connected to the hot water introduction outlet 18.

The tank unit 5 includes a pressure reducing valve 27, a three-way valve 28, a four-way valve 29, a hot water supply mixing valve 30, and a bath mixing valve 31.

The pressure reducing valve 27 is connected to the outlet side of the first water supply pipe 21. The pressure reducing valve 27 is connected to the inlet side of the second water supply pipe 22. The pressure reducing valve 27 is connected to the inlet side of the third water supply pipe 23. The pressure reducing valve 27 is provided so as to be able to adjust the pressure of the water supplied from the first water supply pipe 21.

The three-way valve 28 includes an a port, a b port, and a c port. The three-way valve 28 is provided so as to be able to switch between the flow path connecting the a port and the c port and the flow path connecting the b port and the c port. The a port is connected to the outlet side of the water outlet pipe 25. The a port is provided so that hot water can flow in from the water outlet pipe 25. The b port is provided so that hot water can flow in. The c port is connected to the entry side of the HP going pipe 12. The c port is provided so that hot water can flow out to the HP going pipe 12.

The four-way valve 29 includes an a port, a b port, a c port, and a d port. The four-way valve 29 is a flow path between the path connecting the a port and the b port, the path connecting the a port and the c port, the path connecting the b port and the d port, and the path connecting the c port and the d port. Is provided so that it can be switched. The a port is provided so that hot water can flow out. The b port is provided so that hot water can flow in. The c port is connected to the outlet side of the HP return pipe 13. The c port is provided so that hot water can flow in from the HP return pipe 13. The d port is connected to the inlet side of the hot water supply pipe 26. The d port is provided so that hot water can flow out to the hot water supply pipe 26.

The hot water supply mixing valve 30 is connected to one of the outlets of the second water supply pipe 22. The hot water supply mixing valve 30 is connected to one of the outlet sides of the hot water supply pipe 24. The hot water supply mixing valve 30 is provided so as to be able to generate hot water at a set temperature by adjusting the flow rate ratio between the high temperature water supplied from the hot water supply pipe 24 and the low temperature water supplied from the second water supply pipe 22. Be done.

The bath mixing valve 31 is connected to the other on the outlet side of the second water supply pipe 22. The bath mixing valve 31 is connected to the other end of the hot water supply pipe 24. The bath mixing valve 31 can generate hot water at a set temperature by adjusting the flow rate ratio between the high temperature water supplied from the hot water supply pipe 24 and the low temperature water supplied from the second water supply pipe 22. It will be provided.

The tank unit 5 includes a hot water introduction pipe 32, a hot water lead-out pipe 33, a first bypass pipe 34, and a second bypass pipe 35.

The inlet side of the hot water introduction pipe 32 is connected in the middle of the hot water supply pipe 26. The outlet side of the hot water outlet pipe 33 is connected to the b port of the three-way valve 28. The entry side of the first bypass pipe 34 is connected to the a port of the four-way valve 29. The outlet side of the first bypass pipe 34 is connected to the hot water introduction port 17. The entry side of the second bypass pipe 35 is connected in the middle of the HP going pipe 12. The exit side of the second bypass pipe 35 is connected to the b port of the four-way valve 29.

The tank unit 5 includes a heat source pump 36 and a bath heat exchanger 37.

The heat source pump 36 is provided in the HP going pipe 12. The heat source pump 36 is provided so that hot water can be circulated through various pipes of the tank unit 5. The inlet side of the primary side of the bath heat exchanger 37 is connected to the outlet side of the hot water introduction pipe 32. The outlet side of the primary side of the bath heat exchanger 37 is connected to the inlet side of the hot water outlet pipe 33. The bath heat exchanger 37 is provided so as to be able to heat the water to be heated on the secondary side by using the high temperature water supplied from the hot water storage tank 14 or the HP unit 4. For example, the bath heat exchanger 37 is provided so that the bath water and the heating water can be heated by using the high temperature water supplied from the hot water storage tank 14 or the HP unit 4.

The tank unit 5 includes a first hot water supply pipe 38 and a second hot water supply pipe 39.

The inlet side of the first hot water supply pipe 38 is connected to the hot water supply mixing valve 30. The first hot water supply pipe 38 is provided so that hot water can flow in from the hot water supply mixing valve 30. The second hot water supply pipe 39 is provided as a bath hot water supply pipe. The inlet side of the second hot water supply pipe 39 is connected to the bath mixing valve 31. The second hot water supply pipe 39 is provided so that hot water can flow in from the bath mixing valve 31.

The tank unit 5 includes a bath return pipe 40 and a bath return pipe 41.

The entrance side of the bath flow pipe 40 is connected to the exit side of the secondary side of the bath heat exchanger 37. The outlet side of the bathtub pipe 40 is connected to the bathtub adapter 2. The bath pipe 40 is connected to the outlet side of the second hot water supply pipe 39 on the way. The bath pipe 40 is provided so that hot water can be supplied from the second hot water supply pipe 39. The entrance side of the bath return pipe 41 is connected to the bathtub adapter 2. The outlet side of the bath return pipe 41 is connected to the inlet side of the secondary side of the bath heat exchanger 37.

The tank unit 5 includes a circulation pump 42, a bath temperature sensor 43, and a bath return temperature sensor 44.

The circulation pump 42 is provided in the return pipe 41. The circulation pump 42 is provided so that the bath water can be circulated. The bath temperature sensor 43 is provided in the bath pipe 40. The bath temperature sensor 43 is provided so as to be able to detect the temperature of the hot water supplied from the bath heat exchanger 37. The bath return temperature sensor 44 is provided in the bath return pipe 41. The bathtub return temperature sensor 44 is provided so as to be able to detect the temperature of the bathtub water supplied from the bathtub 1.

The tank unit 5 includes a hot water supply tap 45, a pilot solenoid valve 46 for a bath, and a flow sensor 47 for a bath.

The hot water supply tap 45 is connected to the outlet side of the first hot water supply pipe 38. The hot water supply tap 45 is provided so that hot water can flow in from the first hot water supply pipe 38. The hot water tap 45 is provided so as to be able to supply hot water to a shower (not shown), a curan (not shown), or the like. The bath pilot type solenoid valve 46 is provided in the middle of the second hot water supply pipe 39. The bath pilot type solenoid valve 46 is provided so as to be able to open and close the second hot water supply pipe 39. The bath flow rate sensor 47 is provided on the outlet side of the bath pilot type solenoid valve 46 in the second hot water supply pipe 39. The bath flow rate sensor 47 is provided so that the flow rate of hot water passing through the second hot water supply pipe 39 can be detected by the rotation of the impeller.

The tank unit 5 has a built-in control unit 48.

The control unit 48 is electrically connected to various devices of the HP unit 4. The control unit 48 is electrically connected to various devices of the tank unit 5. The control unit 48 is provided so as to be able to control the operation of these devices.

For example, the control unit 48 detects the temperature distribution of the hot water inside the hot water storage tank 14 based on the detection result of the hot water storage temperature sensor 19. The control unit 48 grasps the amount of remaining hot water inside the hot water storage tank 14 based on the detection result of the temperature distribution of the hot water inside the hot water storage tank 14. The control unit 48 controls the start and stop of the boiling operation of the hot water inside the hot water storage tank 14 by the HP unit 4 based on the amount of remaining hot water inside the hot water storage tank 14.

The remote controller 6 is provided so as to be able to communicate with the control unit 48. The remote controller 6 is provided so as to be able to accept an operation from the outside, for example, an operation corresponding to an operation operation command or a change of a set value.

The remote controller 6 includes an operation unit (not shown). For example, the operation unit is a switch that accepts a user's operation. The remote controller 6 includes a microphone (not shown). The microphone is provided so as to be able to accept the input of the user's voice.

The remote controller 6 includes a notification unit (not shown). The notification unit is, for example, a display unit that outputs information such as the status of the hot water storage type water heater 3 by display, or a speaker that outputs information by sound. The notification unit can display, sound, or voice information such as the state of the hot water storage type water heater 3.

FIG. 2 is a schematic front view of a pilot solenoid valve for a bath of a hot water storage type water heater provided with a hot water supply piping device according to the first embodiment. FIG. 3 is a schematic side view of a pilot solenoid valve for a bath of a hot water storage type water heater provided with a hot water supply piping device according to the first embodiment. The arrows in the figure indicate the flow of hot water.

In FIGS. 2 and 3, the upstream side of the bath pilot solenoid valve 46 is defined as the “primary side”. The downstream side of the bath pilot solenoid valve 46 is defined as the "secondary side".

In FIGS. 2 and 3, the drainage pipe 49 is provided on the secondary side of the bath pilot solenoid valve 46.

In normal times, the primary side of the bath pilot solenoid valve 46 receives the internal pressure of the hot water storage tank 14 (not shown in FIGS. 2 and 3) due to water supply. Therefore, in the bath pilot solenoid valve 46, the internal pressure on the primary side is higher than the internal pressure on the secondary side.

When the water is cut off, the internal pressure of the hot water storage tank 14 drops. Therefore, a negative pressure may be generated on the primary side of the bath pilot solenoid valve 46. Further, when the bathtub 1 (not shown in FIGS. 2 and 3) is installed at a higher place than the hot water storage tank 14, a back pressure may occur on the secondary side of the bath pilot solenoid valve 46. As a result, the hot water in the bathtub 1 may flow back into the hot water storage tank 14. In this case, the hot water is discharged from the drain pipe 49 to the outside of the system.

4 and 5 are side sectional views of a pilot solenoid valve for a bath of a hot water storage type water heater provided with a hot water supply piping device according to the first embodiment. In FIGS. 4 and 5, the drainage pipe 49 is shown in cross section in line AA of FIG. Configurations other than the drainage pipe 49 are shown in cross section on the BB line. The arrows in the figure indicate the flow of hot water.

As shown in FIG. 4, the bath pilot solenoid valve 46 includes a solenoid coil 46a, a plunger 46b, and a diaphragm 46c.

The solenoid coil 46a is provided so that a magnetic field can be generated by an electric current. The plunger 46b is provided so as to be able to move due to a change in the magnetic field of the solenoid coil 46a. The diaphragm 46c is provided so that the plunger 46b can be seated.

The second hot water supply pipe 39 includes a strainer 39a and a first check valve 39b.

The strainer 39a is provided on the primary side of the bath pilot solenoid valve 46. The strainer 39a is provided so as to be able to remove foreign matter when passing water. The first check valve 39b is provided on the primary side of the pilot solenoid valve 46 for bathing. The first check valve 39b is provided on the side of the pilot solenoid valve 46 for the bath with respect to the strainer 39a. The first check valve 39b is provided so as to allow the flow of hot water from the primary side to the secondary side. The first check valve 39b is provided so that the flow path of the second hot water supply pipe 39 can be closed when the water pressure on the primary side is lower than the operating pressure higher than the atmospheric pressure. The first check valve 39b is provided so as to open the flow path of the second hot water supply pipe 39 when the water pressure on the primary side is equal to or higher than the operating pressure.

The drainage pipe 49 is provided on the secondary side of the bath pilot type solenoid valve 46. The drainage pipe 49 is provided so that hot water flowing back from the bath flow rate sensor 47 side can be discharged to the outside of the system. Specifically, the drainage pipe 49 includes an atmospheric release valve 49a and a drainage pipe 49b.

The atmospheric release valve 49a is provided so as to be able to be opened and closed by the water pressure on the primary side of the bath pilot solenoid valve 46. Specifically, the atmospheric release valve 49a is provided so as to be able to open when the water pressure on the primary side of the bath pilot solenoid valve 46 is less than the atmospheric pressure as the first pressure. The atmospheric release valve 49a is provided so that it can be gradually closed when the water pressure on the primary side of the bath pilot solenoid valve 46 becomes a pressure equal to or higher than the atmospheric pressure. The drain pipe 49b is provided so that the hot water flowing back from the atmospheric release valve 49a can be discharged to the outside of the system.

The second check valve 50 is provided on the secondary side of the pilot solenoid valve 46 for bathing as an additional check valve. The second check valve 50 is provided on the side of the bathtub 1 with respect to the flow rate sensor 47 for the bathtub. The second check valve 50 is provided so as to allow the flow of hot water from the primary side to the secondary side. The second check valve 50 is provided so as to prevent the flow of hot water from the secondary side to the primary side.

As shown in FIG. 4, in the normal state, hot water passes through the strainer 39a and the first check valve 39b. The hot water pushes up the diaphragm 46c. As a result, the hot water flows to the secondary side of the bath pilot solenoid valve 46. The hot water is divided into a bath flow rate sensor 47 and a drainage pipe 49.

At this time, the pressure on the primary side of the bath pilot solenoid valve 46 is higher than that on the secondary side. Therefore, the atmosphere release valve 49a is closed. As a result, the hot water is not discharged from the drain pipe 49b. Therefore, all of the hot water passes through the bath flow rate sensor 47 and the second check valve 50. All of the hot water is supplied to the bathtub 1 via the bathtub 40 and the bathtub return pipe 41 (not shown in FIG. 4).

As shown in FIG. 5, when the pressure on the secondary side of the bath pilot solenoid valve 46 is higher than that on the primary side, the hot water is stored in the bathtub 1 not shown in FIG. 5 to the hot water storage not shown in FIG. Attempts to flow back into the tank 14. In this case, the second check valve 50 prevents the backflow of hot water.

If the second check valve 50 fails, the bath pilot solenoid valve 46 prevents backflow of hot water. At this time, the pressure on the secondary side of the bath pilot solenoid valve 46 is higher than that on the primary side. Therefore, the atmosphere release valve 49a is open. As a result, the backflowing hot water is discharged from the drain pipe 49b to the outside of the system.

When the hot water storage tank 14 is supplied with less water during the construction of the hot water storage type water heater 3, a low water pressure of about 0 to 20 kPa is the primary of the pilot solenoid valve 46 for the bath until the hot water storage tank 14 is full. Applied to the side. At this time, when the water pressure on the primary side of the bath pilot solenoid valve 46 reaches atmospheric pressure, the atmospheric release valve 49a closes. After that, when the water pressure on the primary side of the bath pilot solenoid valve 46 becomes higher than the atmospheric pressure, the first check valve 39b opens.

According to the first embodiment described above, when the first check valve 39b is opened, the atmospheric release valve 49a is always closed. Therefore, it is possible to prevent water leakage from the atmospheric release valve 49a.

The opening / closing operation of the diaphragm 46c may be equivalent to the opening / closing operation of the atmospheric release valve 49a. In this case, the diaphragm 46c is always closed when the first check valve 39b is opened. Therefore, it is possible to prevent water leakage from the atmospheric release valve 49a.

Further, in the first check valve 39b, the maximum head pressure generated by the mass of water inside on the upstream side of the second hot water supply pipe 39 may be used as the operating pressure. Specifically, the head pressure applied to the primary side of the bath pilot solenoid valve 46 when the hot water storage tank 14 is full may be used as the operating pressure. In this case, even if the hot water storage tank 14 is supplied with water when the amount of water is less than that of the hot water storage type water heater 3, it is possible to more reliably prevent water leakage from the atmospheric release valve 49a.

Further, the bath pilot solenoid valve 46, the first check valve 39b, and the atmosphere release valve 49a may be arranged in order from the upstream side of the second hot water supply pipe 39. In this case, the hot water does not stay in a high pressure state between the bath pilot solenoid valve 46 and the first check valve 39b. Therefore, it is possible to prevent the flow path from being blocked by freezing when the temperature drops.

Further, the first check valve 39b, the pilot solenoid valve 46 for the bath, and the atmospheric release valve 49a are sequentially arranged from the upstream side of the second hot water supply pipe 39. In this case, the structure between the bath pilot solenoid valve 46 and the atmospheric release valve 49a is simplified. Therefore, it is possible to reduce the size and cost of these structures.

Further, when the water pressure on the primary side is less than the second pressure, which is smaller than the first pressure, the flow path of the second hot water supply pipe 39 may be closed by the second check valve 50. When the water pressure on the primary side is equal to or higher than the second pressure, the flow path of the bath hot water supply pipe may be opened by the second check valve 50. In this case, the second check valve 50 is always open when the atmospheric release valve 49a is closed. Therefore, when the first check valve 39b is opened when the hot water storage tank 14 is being supplied with water when the water is less than that of the hot water storage type water heater 3, the hot water can be released to the bathtub 1. As a result, water leakage from the atmospheric release valve 49a can be prevented more reliably.

Further, the pilot solenoid valve 46 for the bath, the first check valve 39b, and the atmospheric release valve 49a are integrally provided. Therefore, it is possible to reduce the size and cost of these structures more reliably.

Further, when the full water sensor 20 does not detect the fullness of the hot water storage tank 14, the plunger 46b of the bath pilot solenoid valve 46 is opened even if the electric signal for opening the plunger 46b of the bath pilot solenoid valve 46 is received. It does not have to be. In this case, it is possible to prevent water leakage from the drain pipe 49b due to an erroneous operation when the water in the hot water storage tank 14 is less than water.

Further, when the bath flow rate sensor 47 does not detect the flow of hot water, it is not necessary to open the plunger 46b of the bath pilot solenoid valve 46. In this case, it is possible to prevent water leakage from the drain pipe 49b due to an erroneous operation when the water in the hot water storage tank 14 is less than water.

1 tub, 2 tub adapter, 3 hot water storage type water heater, 4 HP unit, 5 tank unit, 6 remote control, 7 air heat exchanger, 8 compressor, 9 water refrigerant heat exchanger, 10 expansion valve, 11 refrigerant piping, 12 HP going pipe, 13 HP return pipe, 14 hot water storage tank, 15 water inlet, 16 water outlet, 17 hot water inlet, 18 hot water inlet, 19 hot water storage temperature sensor, 20 full water sensor, 21 1st water supply pipe, 22nd 2 Water supply pipe, 23 3rd water supply pipe, 24 Hot water supply pipe, 25 Water outlet pipe, 26 Hot water supply pipe, 27 Pressure reducing valve, 28 Three-way valve, 29 Four-way valve, 30 Hot water supply mixing valve, 31 Bath mixing valve, 32 Hot water introduction pipe, 33 Hot water outlet pipe, 34 1st bypass pipe, 35 2nd bypass pipe, 36 Heat source pump, 37 Heat exchanger for bath, 38 1st hot water supply pipe, 39 2nd hot water supply pipe, 39a strainer, 39b 1st Check valve, 40 bath return pipe, 41 bath return pipe, 42 circulation pump, 43 bath return temperature sensor, 44 bath return temperature sensor, 45 hot water tap, 46 pilot type electromagnetic valve for bath, 46a solenoid coil, 46b plunger, 46c Diaphragm, 47 Flow sensor for bath, 48 Control unit, 49 Drainage pipe, 49a Open-air valve, 49b Drainage pipe, 50 Second check valve

Claims (8)

It is provided in the bath hot water supply pipe that supplies hot water to the bathtub, and when the internal water pressure on the upstream side of the bath hot water supply pipe is less than the first pressure, the bath hot water supply pipe is opened with respect to the atmosphere, and the upstream side of the bath hot water supply pipe. An air release valve that closes the bath hot water supply pipe to the atmosphere when the internal water pressure in the above is equal to or higher than the first pressure.
It is provided in the bath hot water supply pipe on the upstream side of the air release valve, and when the internal water pressure on the upstream side of the bath hot water supply pipe is less than the operating pressure larger than the first pressure, the flow path of the bath hot water supply pipe is closed. A check valve that opens the flow path of the bath hot water supply pipe when the internal water pressure on the upstream side of the bath hot water supply pipe is equal to or higher than the operating pressure.
Equipped with
The check valve is a hot water supply piping device in which the maximum head pressure generated by the mass of water inside on the upstream side of the hot water supply pipe is set as the operating pressure. A solenoid valve provided in the bath hot water supply pipe to open and close the flow path of the bath hot water supply pipe.
Equipped with
The atmospheric release valve is provided in the bath hot water supply pipe on the downstream side of the solenoid valve.
The hot water supply piping device according to claim 1 , wherein the check valve is provided in the bath hot water supply pipe between the atmospheric release valve and the solenoid valve. A solenoid valve provided in the bath hot water supply pipe to open and close the flow path of the bath hot water supply pipe.
Equipped with
The atmospheric release valve is provided in the bath hot water supply pipe on the downstream side of the solenoid valve.
The hot water supply piping device according to claim 1 , wherein the check valve is provided in the bath hot water supply pipe on the upstream side of the solenoid valve. When the water pressure inside the bath hot water supply pipe is provided on the downstream side of the air release valve and the internal water pressure on the upstream side of the bath hot water supply pipe is less than the second pressure, which is smaller than the first pressure, the flow path of the bath hot water supply pipe is used. An additional check valve that closes and opens the flow path of the bath hot water supply pipe when the water pressure inside the bath hot water supply pipe is equal to or higher than the second pressure.
2. The hot water supply piping device according to claim 2 or 3. The hot water supply piping device according to any one of claims 2 to 4 , wherein the check valve, the atmosphere release valve, and the solenoid valve are integrally provided. The hot water supply piping device according to any one of claims 2 to 5.
A hot water storage tank provided on the upstream side of the hot water supply piping device,
A control unit that controls the supply of hot water stored in the hot water storage tank to the hot water supply piping device.
A hot water storage type water heater equipped with. A full water sensor that detects the full water of the hot water storage tank,
Equipped with
The hot water storage type water heater according to claim 6 , wherein the control unit does not open the solenoid valve when the full water sensor does not detect the full water in the hot water storage tank. A flow rate sensor provided on the downstream side of the solenoid valve to detect the flow of hot water inside the bath hot water supply pipe.
Equipped with
The hot water storage type water heater according to claim 6 or 7 , wherein the control unit does not open the solenoid valve when the flow rate sensor does not detect the flow of hot water.

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